421 51st Street
421 51st Street in Sunset Park, Brooklyn, has 54 open HPD violations, 5 of them class C, and no rent-stabilized units are on its tax bill, as of Oct 26, 2026. StreetSpy grade: F (49/100).
One & two family · 2 units · Built 1901
StreetSpy grade: F (Severe, 49/100)
- 180 open HPD violations per 10 units, about 18 per apartment. The grade is F for that alone.
- 5 immediately hazardous violations open (the class that covers no heat, pests, lead paint and similar).
- 4 open violations are classified rent-impairing under NY Multiple Dwelling Law section 302-a.
- No rent-stabilized units on the tax bill. Increases aren't capped by stabilization, though Good Cause Eviction may still limit them.
- Repairs: Grade capped at F (54 open, 5 class C), records as of Oct 26, 2026
- Heat and hot water: No complaints, 12 mo, records as of Oct 25, 2026
- Pests: Clear (Owner reported none, 3 yr), records as of Oct 28, 2026
- Safety: High (1 open DOB violation), records as of Oct 26, 2026
- Registration: Renewal not yet in city data, records as of Oct 3, 2026
Housing code violations (HPD)
54 open violations: 5 class C (immediately hazardous), 33 class B, 16 class A. 1 issued in the last 12 months. 90 on record. Oldest open violation issued 1967-08-18. Newest violation issued 2026-05-01.
0 closed in the last 90 days. Median 21 days from issue to close for the 1 violations closed in the last 12 months.
4 open violations are classified rent-impairing under NY Multiple Dwelling Law section 302-a. Section 302-a; NY Courts guidance on getting repairs.
- Class C: Door, lock or intercom defect. , 2007 ADM CODE REMOVE THE ILLEGAL FASTENING DOUBLE CYLINDER LOCK AT METAL GATE AT FRONT COURT, issued 2016-03-07. HPD violation 11143804
- Class C: No heat / heating defect (hallway). POST NOTICE, IN FORM APPROVED BY THE DEPARTMENT, STATING THE NAME AND LOCATION OF THE PERSON DESIGNATED BY THE OWNER TO HAVE KEY TO BUILDINGS HEATING SYSTEM AT BOILER ROOM DOOR AND AT PUBLIC HALL, 1st STORY, issued 2015-09-23. HPD violation 10871321
- Class C: Sprinkler or standpipe defect. PROPERLY REPAIR THE BROKEN OR DEFECTIVE SPRINKLER SYSTEM AT BUILDING, issued 2015-07-14. HPD violation 10781566
- Class C: Door, lock or intercom defect. , 2007 ADM CODE REMOVE THE ILLEGAL FASTENING ; THE DOUBLE CYLINDER LOCK AT GATE IN FRONT OF BUILDING, issued 2014-08-04. HPD violation 10331855
- Class C: No heat / heating defect (hallway). PROVIDE READY ACCESS TO BUILDINGS HEATING SYSTEM .. AT PUBLIC HALL, 1st STORY, issued 2014-08-04. HPD violation 10331870
- Class B: Missing or broken smoke / CO detector, 2nd floor. , 2046 ADM CODE PROVIDE AN APPROVED AND OPERATIONAL SMOKE DETECTING DEVICE, INSTALLED IN ACCORDANCE WITH DEPARTMENT OF BUILDINGS RULES AND REGULATIONS MISSING IN THE ROOM LOCATED AT B-ROOM 3A, 2nd STORY, 3rd B-ROOM FROM WEST AT NORTH (apt 3A), issued 2016-02-18. HPD violation 11118037
- Class B: Missing or broken smoke / CO detector, 2nd floor. , 2046.2 HMC: PROVIDE AN APPROVED AND OPERATIONAL CARBON MONOXIDE DETECTING DEVICE, INSTALLED IN ACCORDANCE WITH APPLICABLE LAW AND RULES. IN THE ROOM LOCATED AT B-ROOM 3A, 2nd STORY, 3rd B-ROOM FROM WEST AT NORTH (apt 3A), issued 2016-02-18. HPD violation 11118041
- Class B: Sprinkler or standpipe defect (hallway). PROVIDE A PIECE OF GARDEN HOSE 10 FEET IN LENGTH WITH FEMALE COUPLING AND A 10 QUART PAIL ON PREMISES TO TEST SPRINKLER SYSTEM. AT PUBLIC HALL, 2nd STORY, issued 2015-12-02. HPD violation 11020474
311 housing complaints
0 in the last 12 months, 0 in 5 years.
Bedbugs
The owner reported 0 infested units in the last 3 years of filings. HPD's bedbug filings are self-reported by the owner once a year; HPD does not inspect to confirm them.
- 2026: No bedbug filing on record for this year
- 2025: Owner reported 0 infested units
- 2024: Owner reported 0 infested units
- 2023: No bedbug filing on record for this year
- 2022: No bedbug filing on record for this year
- 2021: Owner reported 0 infested units
Buildings department (DOB)
1 open DOB violation, a Local Law violation issued before 2000. 5 DOB violations on record. Check on DOB BIS.
Evictions and housing court
0 executed evictions in the last 3 years (0 on record). 0 open HPD cases; 0 harassment findings.
Rent stabilization
No rent-stabilized units on the tax bill.
Owner and management
Owner: JAIRO J DIAZ. Managing agent: JAIRO J DIAZ. See the full portfolio.
Last HPD registration Aug 12, 2025. Registration on file through Sep 1, 2026; renewal not yet in the city's data.
Tax lot and city IDs
BBL 3007910069, HPD building ID 155035. HPD Online, ACRIS, DOB BIS.
Nearest subway
- 53 St (R), 2 min walk
- 45 St (R), 5 min walk
- 59 St (N, R), 8 min walk
How the grade is calculated
| Factor | On record | Points |
|---|---|---|
| Open HPD violations | 54 open (5 class C, 33 class B, 16 class A). 4 rent-impairing | −45 |
| 311 housing complaints (12 mo) | None | 0 |
| Bedbug reports (3 yr) | None reported | 0 |
| Executed evictions (3 yr) | None | 0 |
| Housing litigation | No open cases | 0 |
| Open DOB violations | 1 open DOB violation, a Local Law violation issued before 2000 | −5 |
| Density cap | 180 per 10 units (about 18 per apartment). Grade capped at F: 100 or more open HPD violations per 10 units. | −1 |
Sources: NYC HPD Housing Maintenance Code Violations, NYC 311 Service Requests, NYC HPD Bedbug Reporting, NYC Marshal Evictions (DOI), NYC HPD Housing Litigations, NYC DOB Violations, NYC DOF tax bills (via JustFix Who Owns What portfolio API, v2), NYC HPD Property Registration. Methodology. Report generated 2026-10-28.